Okay, this is a little bump, but for those of you who have the Sprint LG G2 (LS980), I have a solution. The LS980's Hidden Menu is different from the other versions, and I found where to update the Touch Firmware today by sifting through trying all the different tests to see if anything will trigger the Knock On to work. Here goes.
1. Open your Phone app.
2. Dial 5689#*980# (you won't see the last #).
3. Navigate to HW Device Test (Entry #2) > Touch Test (Entry #4) > Touch Firmware Upgrade (Entry #11) *
4. Wait for about 10 seconds for the firmware to upgrade.
5. Hit Home to exit the Hidden Menu.
6. Try Knock Off
7. Try Knock On
8. ???
9. Profit!
Hopefully that works for you guys.
* Number 3: if you've been in the Hidden Menu recently (since your last reboot) you may have to tap your back button a few times to get back to the root of the Hidden Menu.
Oh, and for reference, here's my Touch Firmware Info:
EDIT: Get to Touch Firmware Info by going into Touch Test and tapping Touch Firmware Version (Entry #10).
Code:
Touch Firmware Version:
====== Firmware Info ======
ic_fw_identifier = PLG208-1
ic_fw_version = E067
img_fw_product_id= PLG208
img_fw_version = E067
ic_chip_rev = 2
bootloader_fw_ver= 0
lcd_panel_type(boot)= 0
lcd_panel_type(current)= 0